Grandstream Networks GXP1760 Administration Manual page 24

to the STUN server. If NAT type is Full Cone, Restricted Cone or Port-Restricted
Cone, the phone will try to use public IP addresses and port number in all SIP
& SDP messages. The phone will send empty SDP packet to the SIP server
periodically to keep the NAT port open if it is configured to be "Keep-alive".
Configure this to be "No" if an outbound proxy is used. "STUN" cannot be used
if the detected NAT is symmetric NAT. Set this to "VPN" if OpenVPN is used.
Determines a SIP Extension to notify the SIP server that the phone is behind a
Proxy-Require
NAT/Firewall. Do not configure this parameter unless this feature is supported
on the SIP server.
Account x  SIP Settings  Basic Settings
Determines if the phone has an assigned PSTN telephone number. This field
should be set to "User=Phone", so that "User=Phone" parameter will be
TEL URI
attached to the Request-Line and "TO" header in the SIP request to indicate the
E.164 number. If set to "Enable", "Tel:" will be used instead of "SIP:" in the SIP
request. The default setting is "Disable".
Selects whether or not the phone will send SIP Register messages to the
SIP Registration
proxy/server. The default setting is "Yes".
Permits the SIP user's registration information to be cleared when the phone
Unregister On
reboots. The SIP Contact header will contain "*" to notify the server to unbind
Reboot
the connection. The default setting is "No".
Specifies the time interval (in minutes) in which the phone refreshes its
Register Expiration
registration with the specified registrar. The default value is 60 minutes. The
maximum value is 64800 minutes (about 45 days).
Reregister Before
Specifies the time interval (in seconds) that the phone sends re-registration
Expiration
request before the Register Expiration. The default value is 0.
Enable OPTIONS Select whether or not the phone will keep sending a message to check the
Keep Alive connection with the server.
Specifies the time interval (in second) in which the phone will send the Keep
OPTIONS Keep
Alive Interval Alive message to the server.
Specifies the maximum number of allowed lost packet before the phone will
OPTIONS Keep
Alive Max Lost refresh its registration.
Defines the local SIP port used to listen and transmit. The default value is 5060
Local SIP Port
for Account 1, 5062 for Account 2, 5064 for Account 3, 5066 for Account 4. The
valid range is from 1 to 65535.
SIP Registration
Specifies the time interval to retry registration if the process is failed. The valid
Failure Retry Wait
range is 1 to 3600. The default value is 20 seconds.
Time
SIP T1 Timeout is an estimate of the round trip time of transactions between a
SIP T1 Timeout
client and server. If no response is received the timeout is increased, and
GXP17xx Administration Guide
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